| Walton upon Thames to Opwijk | 201.18 mi (323.76 km) |
| Walton upon Thames to Ostend | 144.37 mi (232.34 km) |
| Walton upon Thames to Oud-Heverlee | 223.61 mi (359.86 km) |
| Walton upon Thames to Oud-Turnhout | 232.87 mi (374.77 km) |
| Walton upon Thames to Oudenaarde | 177.94 mi (286.37 km) |
| Walton upon Thames to Oudenburg | 148.16 mi (238.44 km) |
| Walton upon Thames to Oupeye | 267.14 mi (429.91 km) |
| Walton upon Thames to Overijse | 218.66 mi (351.90 km) |
| Walton upon Thames to Overpelt | 252.05 mi (405.64 km) |
| Walton upon Thames to Paal | 242.91 mi (390.92 km) |
| Walton upon Thames to Peer | 254.21 mi (409.11 km) |
| Walton upon Thames to Pepinster | 276.80 mi (445.46 km) |
| Walton upon Thames to Peruwelz | 184.03 mi (296.16 km) |
| Walton upon Thames to Perwez | 233.28 mi (375.43 km) |
| Walton upon Thames to Philippeville | 231.71 mi (372.89 km) |
